An inverse scattering problem for the Klein-Gordon equation with a classical source in quantum field theory

An inverse scattering problem for a quantized scalar field ${\bm ϕ}$ obeying a linear Klein-Gordon equation $(\square + m^2 + V) {\bm ϕ} = J \mbox{in $\mathbb{R} \times \mathbb{R}^3$}$ is considered, where $V$ is a repulsive external potential and $J$ an external source $J$. We prove that the scattering operator $\mathscr{S}= \mathscr{S}(V,J)$ associated with ${\bm ϕ}$ uniquely determines $V$. Assuming that $J$ is of the form $J(t,x)=j(t)ρ(x)$, $(t,x) \in \mathbb{R} \times \mathbb{R}^3$, we represent $ρ$ (resp. $j$) in terms of $j$ (resp. $ρ$) and $\mathscr{S}$.

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